netbsd/unwind.c

/*
 *
 * honggfuzz - architecture dependent code (NETBSD/UNWIND)
 * -----------------------------------------
 *
 * Author: Kamil Rytarowski <n54@gmx.com>
 *
 * Copyright 2010-2018 by Google Inc. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License. You may obtain
 * a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * permissions and limitations under the License.
 *
 */

#include "netbsd/unwind.h"

#include <endian.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "honggfuzz.h"
#include "libhfcommon/common.h"
#include "libhfcommon/log.h"

/*
 * Nested loop not most efficient approach, although it's assumed that list is
 * usually target specific and thus small.
 */
char* arch_btContainsSymbol(
    size_t symbolsListSz, char** symbolsList, size_t num_frames, funcs_t* funcs) {
    for (size_t frame = 0; frame < num_frames; frame++) {
        size_t len = strlen(funcs[frame].func);

        /* Try only for frames that have symbol name from backtrace */
        if (strlen(funcs[frame].func) > 0) {
            for (size_t i = 0; i < symbolsListSz; i++) {
                /* Wildcard symbol string special case */
                char* wOff = strchr(symbolsList[i], '*');
                if (wOff) {
                    /* Length always > 3 as checked at input file parsing step */
                    len = wOff - symbolsList[i] - 1;
                }

                if (strncmp(funcs[frame].func, symbolsList[i], len) == 0) {
                    return funcs[frame].func;
                }
            }
        }
    }
    return NULL;
}